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Kmake/deps/v8/test/mjsunit/turboshaft/maglev-frontend/store-uint32-to-smi-field.js
2026-05-26 23:36:42 -07:00

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JavaScript

// Copyright 2024 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Flags: --allow-natives-syntax --turbolev --turbofan
// Flags: --no-always-turbofan
var u = new Uint32Array(2);
u[0] = 1;
u[1] = 0xEE6B2800;
// Creating an object with a Smi field `x`.
let o = { x : 42 };
function foo(i) {
// Storing a Uint32 to a Smi field.
o.x = u[i];
};
%PrepareFunctionForOptimization(foo);
foo(0);
assertEquals(u[0], o.x);
%OptimizeFunctionOnNextCall(foo);
foo(0);
assertEquals(u[0], o.x);
assertOptimized(foo);
// Triggering deopt by trying to store non-smi
foo(1);
assertEquals(u[1], o.x);
assertUnoptimized(foo);